Coal stoker



Sept; 21, 1937. L. E. BARRNGER coAL sToKER `Filed Deo. 28,1935

s) PATENToFt-ICE *Lani-ence `Edward Bax'ringer,Carnegie',4 Pa., as`l *signor offene-half n negierlav` f i i y A n 4" Claims. `'"I'ne, presentinventive ,conceptionv relates ,to` an "especially important improvementwhich is par-f ticularly, butmnot:necessarily, well adapted. for

incorporation inwa coalstoker such `as isused 5 `i'or,,fveelingfor deliveringlcoalor"equivalent fuel toa boiler `or iurnace, or the like. i o Vf will beA evident, however, from the succeed,- ing -description, accompanying drawings, and; the

o `claims the gist. or the invention is predicated i U upon 'Wlfiatmay beexplicitlyireierredto,as a new and novel conveyor Asuch as may be,V satisfactorily incorporateddn al more orv less conventional d Stokersystem,iwherein'fthe conveyor is 'substan Itis amatter of, common knowledge that coal and the likeintroduced into the supply hopper is` laden ,i with extraneous] objects ando-materials, i such `as, pieces ofwirle, screen, nails, "and so on,

o which tendtowobstruct :the freefeed and flow im from the `hopper through "the" deliverytube and into the boilerifgobservation discloses `that the stricture: in `thefdelivery, conduit, `ofvrhicli vthe g -jliaseof lthe hopper `forms a portion, bausesithe l lodgingmaterialj to pack and clog Kat* the pointoff 26 legress `from the baseoftheghopper.; ,Under the,

circumstances, an" unusuallmstoutfeed screw and a sturdy assemblagefof partsis essential Ito withstand,"this` stress and strain.aEven so the structure is frequently incapablenoi providing a 30 requisitecontinuitythefieed action andu a breakdownoccurs.` 4 i y i y j `jfI have therefore discoveredfthegneed for` the provision of a newtype ci `feed i screw which pro"- videsthe requisite-clearanceto renderthefas;l semblagevsubstantially obstructioni-proof. i 1 w lOther featuresand advantages obviously linked with` the `Special Iadattati011` end -impfevemeiit willbecome morereadilyf apparent `fromithe foli `lowing description and accompanying drawings. i In` `,the accompanying ,pictorialufldrawings wherein like numerals are employed to designate corresponding parts throughout the views:

Figure 1 is acomplete elevational assemblage view disclosing the coordination of theboiler land stoker and illustrating,` so far as external appearance is concerned, `that the arrangement` appears standardized or normal. l f `Figure 2 is a view, partly insection, and partly in elevation showing the improved worm or wf feed screwand associated features, .perfectedv J "inaccordance with my idea.`

5 Figure 4 is an venlarged section taken approxito Philip Hubacher, Card Applicationncemmr` 2s, `1935@ seriaifNo, 56,563 i" (Cl. 198-64) I n o mately on the plane of the line 4f`4 of Figure 2f looking in' the direction of the arrowsv with the casing removed and parts of the iin broken away.

Referring nowto the general assembly dis-Y closed in Figure `1, it will be lobserved that the boiler, which may be of anysuitable size, is indicatedbythe numerali'i` The coal'stoker, as a unit, is denoted bythe numeral `li `and a conveyor propulsion `motoris `indicated`at,"l. i, i

Observing no'wl'ig'ure 2, jitwillbe seen that the `f oundationis indicatedat` 8, thisbellgfof appropriate form and supported on this is the base receptacle@ ofthe hopper ensemble. The

ceiving" and deliveryconduitggthe' deliveryrpors Vtion ofthe conduit being in theform of a regular tube or pipe I2. The` restricted discharge openo ing",` I 3; which affords communication between the base` il and the tube I2 is the objective `which has `heretoforehin conjunction,with` the conveyor,

causedaccumulation andv clogging with a resultl `ant frequent closing downjof the Stoker `system to either make repairs or dislodge the jam occurring at the juncture I3 between the parts Sand I2.

It hasjbeen discoveredthat by properly' constructinglthe worm or feed screw and ingeniouslir adapting its featuresto'therestrictedoutlet I 3i, the line is rendered "substantially"obstruction or Yclog-proof. *Broadly then, the novelty has to do with` meansincorporated inthe `conduit (parts.

9 and I2) which affords thenecessary clearance and relief and at the Sametime provides the requisite continuity in the feed action.` Whereas this may be accomplished otherwise, the preferred embodiment of the inventionis that deregulation type, is indicatedby the numeral I4 and is connected with the motor'at one end and extends through the conveyor tube I2, being mounted for rotation in suitable bearings (not shown). The helical threads, or impeller fin may `be divided into two companion successively `co operable sections 'I5 and I`6,'the,secticn I5 being confined in the base 9 and the section I E in the `tube I2. The terminal end portion 'I'I of the threads on the sectionV I5 is `cut off, soto speak,

so thatthe extremity I8 thereof is at right angles to the longitudinal `axis of the rotaryeed Worm shaft I4. Moreover, in practice itis spaced one inch `or more fromthe 'restricted outlet or juncture I3. This is suiiicient to provide the desired spiral activity and thrust action to forcibly feed the mass of material into the opening I3 and to at the same time compensate for possible clogging because of the clearance provided. In other 5 words, this terminal I3, is aptly fitted to literally press or cam" the load into and through the oriflee I3 to be picked up and carried on by the progressively acting companion screw section I6. The major thread portion of the section I6, indicated at I9, is conventional. It is to be observed, however, that the inmost convolution terminates in close spaced proximity to the intake I3 and is fashioned into what may be conveniently described as a pick-up hook or'claw 20. As better shown in Figure 3, the facility with which this hook acts is enhanced by the special formation bf the bill 2| and the associated beveled knifeedge 22. This edge has a concave curvature, the outer extremity or tip of the claw being in advance of the root or point where the edge joins the shaft, as the screw'rotates.

Looking at the alleged novelty from another viewpoint, it may be simply said that the feeding thread of the conveyor or worm is merely broken to form a gap, the said gap occurring at the Junction I3 in such a Way as to provide the requisite continuity in the feed. Thus the features I5 and I 6 are to be considered separately and collective1y, since the fundamental novelty is predicated upon structural means embodied in the conduit (parts 9 and I0 as a unit) wherein the feed screw is constructed at the point of stricture to provide progressive feeding and pick-up and to avoid clogging at this vital point.

Emphasis is to be accorded the featurev 22 which, as isevident from the drawings, tends to cause obstructions, such as nails and other unyielding objects, to ride radially in toward the 40 axis of rotation or shaft, instead of permitting the objects to ride.. radially outward to interfere with the eiiluent action of the load. It is primarily a curvature of this edge 22 which causes the inward cam action.

45 It is thought that persons skilled in the art to which the invention relates will be able to obtain a clear understanding of the invention after considering the description in connection with the drawings. Therefore, a more lengthy descrip- 50 tion is regarded as unnecessary.

l Minor changes in shape, size, and rearrangement of details coming within the field of invention claimed may be resorted to in actual practice, if desired.

What is claimed is:

1. A conveyor screw comprising a shaft having ahelical thread at one end terminating Vin a presser fin, the terminal of said fin being blunt and disposed at right angles to the longitudinal axis of the shaft, an additional helical thread on the shaft in spaced relation to said presser n and having a hooked pick-up element confrontying the presser n.

2. A conveyor screw comprising a shaft having ahelical thread at one end terminating in a presser fin, the terminal of said fin being blunt and disposed at right angles to the longitudinal axis of the shaft, an additional helical thread on the shaft spaced from said presser iin and having a crooked pick-up element, and said element having a beveled and curved knife-edge in the manner and for the purposes described.

3. In combination, a coalhopper formed with an unrestricted opening of constant area in the side adjacentl the bottom thereof, a horizontal delivery tube joined to the hopper and registering with said opening, a horizontal shaft extending through said hopper and delivery tube and the opening, a symmetrical helical conveyor finradiating from the shaft and being interrupted for a space on the shaft extending on each side of the opening, the iin being otherwise continuous throughout the hopper and delivery tube, the interrupted edge of the finv on the hopper side of the opening being radial to push coal and refuse into the opening, the interrupted edge of the n on the .delivery tube side of the opening being concavely curved and formed with a bevelled knife edge having a leading outer extremlty to provide'a bulto bite into the coax and refuse clogged in the opening and advance the cloggings in the path of the n in the delivery tube.

'4. In combination, a coal hopper formed with an opening in the side thereof, a delivery tube joined to the hopper having the chamber thereof registering with said opening, a shaft`extending through said hopper and delivery tubevand the opening, a helical conveyor fin' mounted on the shaft and beingl interrupted for a space on the shaft extending on each side of the opening, the fin being otherwise continuous throughout the hopper and delivery tube, the interrupted edge of the iin on the hopper side of the opening being radially disposed with 'respect to the shaft to push the coal and refuse into the opening, the tip of the interrupted edge of the iin on the delivery tube side of the opening being in advance of the point where the edge of the fin joins the shaft to provide a leadingbill to bite into the coal and refuse clogged in the opening and advance the clogglngs into the path of the fin in the delivery tube.

LAURENCE EDWARD BARRINGER. 

